This document summarizes a research seminar about the marginalization of mature-aged workers. It discusses a qualitative study with 32 participants aged 45-70 in Toowoomba, Australia, who had experienced unemployment or underemployment. Key themes that emerged included the marginal employment experiences, impacts on well-being such as health and finances, and ways participants coped. The literature review found that negative perceptions of older workers' productivity is a major cause of their marginalization, despite evidence they perform well. The seminar highlighted gaps in understanding the personal impacts of marginalization from those affected and discussed implications of an aging population on the labor market.